Employee turnover creates costs, but the cost is rarely captured by one universal percentage of salary. Different roles create different recruitment, vacancy, training, productivity and customer-impact costs, and organisations should build their own model rather than relying on a single headline multiplier.<\/p>\n
This guide focuses on the business case for employee retention<\/strong>: how to identify the real cost of unwanted turnover, which costs are direct or indirect, and how to decide where retention investment is economically justified.<\/p>\n For the broader evidence on why employees stay or leave and what employers can do, see MATSH’s Employee Retention Strategies<\/a> guide. For the metric itself, see Employee Retention Rate: Definition, Formula and How to Interpret It<\/a>.<\/p>\n Older HR articles often state that replacing any employee costs a fixed percentage of salary. The problem is that replacement cost depends heavily on role, labour market, time to fill, onboarding complexity and the value of lost capacity.<\/p>\n Gallup’s current retention research, for example, gives very different replacement-cost estimates for frontline employees, technical professionals, and leaders or managers. That alone shows why one multiplier should not be applied to every role.<\/p>\n Source: Gallup, Employee Turnover Is Preventable but Often Ignored, updated 2026<\/a><\/p>\n Use external benchmarks as a sense check, not as a substitute for your own cost model.<\/p>\n Not every departure creates the same business problem.<\/p>\n If the objective is to build a retention business case, focus first on voluntary and regrettable departures in roles where the organisation experiences meaningful disruption.<\/p>\n Include costs such as:<\/p>\n New employees need time and support before they operate independently. Include:<\/p>\n A vacant position can create costs even before a replacement is hired.<\/p>\n Depending on the role, these can include:<\/p>\n For some roles, vacancy cost will be much larger than recruitment fees.<\/p>\n A replacement being hired does not mean the organisation has immediately recovered its former capacity.<\/p>\n SHRM recommends measuring time to productivity as part of onboarding evaluation. Organisations can define the level of performance expected for independent contribution in a role and measure how long new hires take to reach it.<\/p>\n Source: SHRM, How to Measure Onboarding Success<\/a><\/p>\n The productivity gap can be especially important in specialist, client-facing and leadership roles.<\/p>\n Turnover creates work for people who remain.<\/p>\n Managers may need to:<\/p>\n Colleagues may spend time answering questions, covering work and transferring knowledge. Those hours may not appear as a separate invoice, but they still consume organisational capacity.<\/p>\n Some roles carry relationships that are difficult to transfer immediately.<\/p>\n Possible effects include:<\/p>\n Do not automatically assign a monetary value unless you can support it. Track observable outcomes such as account loss, service delays, complaint trends or revenue changes where relevant.<\/p>\n Experienced employees can hold valuable institutional knowledge, but “institutional knowledge” should not become a vague justification for retaining everyone indefinitely.<\/p>\n Ask:<\/p>\n This can also reveal process weaknesses. If one person leaving creates major operational risk, the organisation may need better documentation, succession and knowledge-sharing systems.<\/p>\n A practical model can be built from the following components:<\/p>\nWhy universal turnover-cost rules are weak<\/h2>\n
Start by defining which turnover you are analysing<\/h2>\n
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Direct turnover costs<\/h2>\n
Recruitment<\/h3>\n
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Onboarding and training<\/h3>\n
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Vacancy costs<\/h2>\n
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Time-to-productivity matters<\/h2>\n
Manager and team time are real costs<\/h2>\n
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Customer and relationship costs<\/h2>\n
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Knowledge loss is role-specific<\/h2>\n
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Build a role-specific turnover-cost model<\/h2>\n